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The diode is a 1N5406. It's a common 3 amp diode. $0.41 each Source ---> 1N5406 Diode Are you sure the resistor(s) need replacing?

A bit of an oddity... In your picture R14 is marked as a 50 ohm resistor. Multiple versions of the TM that I've checked indicate it's a 40 ohm resistor. Seems either would work fine in this application. To get a replacement 50 ohm version that fits right in is available here ---> 50 Resistor

R14 would have nothing to do with your batteries being drained. R14 is just a current limiting resistor in the field flashing circuit. I can look tomorrow for a replacement source.

Since the Exciter ohms out OK I'd say the R14 resistor is bad.

Based on those readings it would appear that R14 is defective. Do a couple of other tests before we condemn R14. With the set OFF and Dead Crank in OFF do the following. 1) Remove the wires from the AC Voltage Regulator terminals 1 & 3. Label if needed so they don't get mixed up. 2) Measure...

OK now take the following DC voltage measurements. Hook you meters negative lead to the ground stud above the relays on the back wall. With the set running check for the following voltages and reply what you measure for each test. 1) Measure the DC voltage at R14 terminal 1 with S1 held in the...

So you do NOT get any AC voltage at the outlet with the set running and S1 in START? Please confirm.

OP had posted " runs like a top everything checks out on gauges except the battery charger gauge shows running on discharge side while running " I assume when they said "everything" it included the AC Voltage gauge.

Guy, Yes, Saw that S1 was mis-wired, set running but no AC

Have you downloaded the -24 TM? It has a test procedure for the AC voltage regulator in it. The set was built with one two voltage regulator systems. TRC or Libby. Be sure to use the correct test procedure in the TM.